Water container to tube, pipe or hose adapter

thingiverse

Needed to try connecting a washing machine to a water canister for use without running water, although this form of a tube adapter is probably useful for many other situations. The sizes I used are for very specific combination, but decided to make it customizable for same effort. The larger base of the adapter is threaded on the inside, the thin pipe at the top is threaded on the outside. The thin pipe continues through the part to the ground, serving as both printing support and positioning a rubber ring if needed. It printed well for me in 0.1mm ABS without support, tried to print it solid with concentric paths, but I think Slic3r didn't make it wholly solid. The plastic doesn't seem to leak, but the threads on the water canister do leak, even with the rubber piece, so my thread parameters might be slightly off. As for the washing machine, the water pressure doesn't seem to be high enough, so it's back to the drawing board for me... Main part of this job done by TrevM's ISO metric thread lib: http://www.thingiverse.com/thing:311031 Instructions The piece is designed to print without support. Do not try to make the bottom tube diameter so small that the support tube and rubber ring width won't fit within it, that won't work. It would be easy enough to modify the SCAD file to make the support tube disappear if the diameters are close to each other, and make a conical base support joining the tubes if the bottom tube is smaller than the top. However, that was not my intent when making this thing, my interests are very singular. The parameter names are shorthands, and are given in millimeters as usual. Diameters are thread diameters (diameter of the outside of the thread on the "bolt" basically), so that a M22x2 thread would translate to diameter 22, pitch 2. Rubber ring width is substracted from bigger tube thread radius. I think it's pretty snug fit if your measures are correct. Quality is number of segments the cylinders are divided to. Wall thickness and quality apply to each piece, though it would be trivial to allow specifying them separately for different pieces, I think that's more customization than is needed. In the sample default sizes, the top thread is M25x1 or one inch, and the bottom tube is M40x2, which seems to closely approximate the threads I was connecting. The 2mm thread pitch on the bottom tube causes the threads to also stand about 2mm out, which was far too much for the mouth of the canister I was attaching it to, so the lower piece thread depth is cut to 1mm max. However, even leaving just 4 millimeter groove for the rubber ring, the 4mm overhangs are terribly uneven, and don't appear to make a clean seal against the rubber ring. I'm thinking I might let little acetone soak up in the groove and hope it will dry up smooth. Acetone slurry might work somewhat too if you get a hollow piece with holes in it. Alternatively I might re-design it to stand on the lower tube with conical support extending up to the base of the wider tube at the top, serving also as a grip to screw it on and off. That would be challenging to print due to warping and getting it to stick to the printing surface.